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Contractual interest rate for funds borrowed, under the debt agreement.

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Financial Liabilities - Additional Information (Detail) - USD ($)							9 Months Ended
	May 31, 2018	Feb. 21, 2018	Feb. 14, 2018	Feb. 08, 2018	Dec. 28, 2017	Feb. 08, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Debt Instrument [Line Items]
Payment of debt instrument, aggregate principal amount							$ 23,612,000	$ 42,805,000
Debt instrument, outstanding prinicipal balance							13,321,000		$ 13,736,000
Loss on extinguishment of debt							$ 1,369,000	$ (977,000)
3VR
Debt Instrument [Line Items]
Date of acquisition completed			Feb. 14, 2018
Business combination, issuance of notes			$ 2,000,000
Repayment of indebtedness outstanding of acquiree		$ 3,600,000
Term Loan
Debt Instrument [Line Items]
Debt instrument, outstanding prinicipal balance									5,000,000
Term Loan \| Venture Lending & Leasing VII and VIII, Inc.
Debt Instrument [Line Items]
Loan maturity date							Aug. 08, 2020
Debt instrument, interest per annum rate						12.50%
Debt instrument scheduled interest accrued and payable						80.00%
Debt instrument, interest term						12 months
Payment of debt instrument, aggregate principal amount					$ 5,000,000
Debt instrument, outstanding prinicipal balance					10,000,000
Debt instrument payment, principal and interest					5,900,000
Debt instrument, outstanding principal					5,000,000
Debt instrument, accrued and unpaid interest outstanding					900,000
Loss on extinguishment of debt					$ 1,800,000
Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument, outstanding prinicipal balance							$ 11,321,000		$ 8,736,000
Revolving Credit Facility \| Minimum
Debt Instrument [Line Items]
Line of credit facility liquidity covenant in cash						$ 4,000,000
Notes Payable
Debt Instrument [Line Items]
Debt instrument, outstanding prinicipal balance							2,000,000
Notes Payable \| 3VR
Debt Instrument [Line Items]
Business combination, issuance of notes							$ 2,000,000
Annual interest rate of notes							3.00%
Notes payable, description							The Company issued subordinated unsecured promissory notes (“notes payable”) in the aggregate principal amount of $2.0 million, with an annual interest rate of 3.0%, payable on the one year anniversary of the closing date.
Previous Lender
Debt Instrument [Line Items]
Warrants to purchase common stock cancelled							400,000
Loan and Security Agreements
Debt Instrument [Line Items]
Line of credit facility customary fees and expenses including facility fees							$ 120,000
Loan and Security Agreements \| Term Loan \| Venture Lending & Leasing VII and VIII, Inc.
Debt Instrument [Line Items]
Payment of debt instrument, aggregate principal amount	$ 10,000,000
Debt instrument payment, principal and interest	5,200,000
Debt instrument, outstanding principal	4,600,000
Debt instrument, accrued and unpaid interest outstanding	600,000
Loss on extinguishment of debt	$ 1,400,000
Loan and Security Agreements \| Revolving Credit Facility
Debt Instrument [Line Items]
Borrowing capacity under non-formula line of credit						$ 3,000,000
Line of credit facility early termination fee percentage						1.00%
Interest payable monthly date							Mar. 01, 2017
Line of credit facility additional facility fees paid				$ 40,000
Loan and Security Agreements \| Revolving Credit Facility \| Prime Rate
Debt Instrument [Line Items]
Percentage of interest rate						1.00%
Loan facility payable date							Feb. 08, 2019
Loan and Security Agreements \| East West Bank \| Revolving Credit Facility
Debt Instrument [Line Items]
Borrowing capacity under credit facility						$ 16,000,000
Loan and Security Agreements \| Venture Lending & Leasing VII and VIII, Inc. \| Term Loan Facility
Debt Instrument [Line Items]
Borrowing capacity under credit facility						$ 10,000,000